Read Sony CMT-C7NT / HCD-C7NT Service Manual online
39
HCD-C7NT
9. Press the
ENTER/YES “R”
button to display “EFB = MO-
P”.
Then, the optical pick-up moves to the pit area automatically
and servo is imposed.
Then, the optical pick-up moves to the pit area automatically
and servo is imposed.
10. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the .
“R”
or
>
“R”
button.
Traverse Waveform
11. Press the
ENTER/YES “R”
button to display “EF MO CHECK”
(C14).
The disc stops rotating automatically.
The disc stops rotating automatically.
12. Press the
MD
Z button and take out the disc.
13. Load the check disc (TDYS-1).
14. Press the .
14. Press the .
“R”
or >
“R”
button and display “EF CD
CHECK” (C15).
15. Press the
ENTER/YES “R”
button to display “EFB = CD”.
Servo is imposed automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the .
“R”
or
>
“R”
button.
Traverse Waveform
17. Press the
ENTER/YES “R”
button to display “EF CD
CHECK” (C15).
18. Press the
MD
Z button and take out the check disc (TDYS-1).
Checking Location: BD (MD) board (see page 44)
6-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the .
1. Load the test disc (MDW-74/GA-1).
2. Press the .
“R”
or >
“R”
button to display “CPLAY
2MODE” (C36).
3. Press the
ENTER/YES “R”
button to display “CPLAY 2MID”.
4. Press the
MENU/NO “R”
button when “C = AD =
” is displayed.
5. Press the .
“R”
or >
“R”
button to display “FBIAS
CHECK” (C16).
A
B
VC
Specified value : Below 10% offset value
Offset value (%) = X 100
I
A – B
I
2 (A + B)
A
B
VC
Specified value : Below 10% offset value
Offset value (%) = X 100
I
A – B
I
2 (A + B)
6. Press the
ENTER/YES “R”
button to display “ / c =
”.
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
after [/] indicate ADER, and the 2 digits after [c =] indicate the
focus bias value.
Check that the C1 error is below 20 and ADER is below 2.
7. Press the
ENTER/YES “R”
button to display “ / b =
”.
Check that the C1 error is about 100 and ADER is below 2.
8. Press the
ENTER/YES “R”
button to display “ / a =
”.
Check that the C1 error is about 100 and ADER is below 2.
9. Press the
MENU/NO “R”
button, then press the
MD
Z button
and take out the test disc.
6-8. C PLAY Check
MO Error Rate Check
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the .
1. Load the test disc (MDW-74/GA-1).
2. Press the .
“R”
or >
“R”
button to display “CPLAY
2MODE” (C36).
3. Press the
ENTER/YES “R”
button to display “CPLAY 2MID”.
4. The display changes to “C = AD = ”.
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the
MENU/NO “R”
button to stop playback, then press
the
MD
Z button and take out the test disc.
CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
2. Press the .
1. Load the check disc (TDYS-1).
2. Press the .
“R”
or >
“R”
button to display “CPLAY
2MODE” (C36).
3. Press the
ENTER/YES “R”
button to display “CPLAY 2MID”.
4. The display changes to “C = AD = )”.
5. Check that the C1 error rate is below 20.
6. Press the
5. Check that the C1 error rate is below 20.
6. Press the
MENU/NO “R”
button to stop playback, then press
the
MD
Z button and take out the check disc.
6-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
and check the error rate.
Procedure:
1. Load a recordable disc (blank disc).
2. Press the .
1. Load a recordable disc (blank disc).
2. Press the .
“R”
or >
“R”
button to display “CREC
2MODE” (C37).
3. Press the
ENTER/YES “R”
button to display “CREC 2MID”.
4. When recording starts, “
REC
” and display “CREC 2 @@@@”
(@@@@ is the address).
5. About 1 minute later, press the
MENU/NO “R”
button to stop
continuous recording.
6. Press the .
“R”
or >
“R”
button to display “CPLAY
2 MODE” (C36).
7. Press the
ENTER/YES “R”
button to display “CPLAY 2
MID”.
8. “C = AD = )” will be displayed.
9. Check that the C1 error becomes below 20 and the AD error
9. Check that the C1 error becomes below 20 and the AD error
below 2.
10. Press the
MENU/NO “R”
button to stop playback, then press
the
MD
Z button and take out the disc.
REC
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